Furnace.



No. 789,093. PATENTED MAY 2,1905.

T. E. HUNT. FURNACE.

APPLICATION FILED JULY 13, 1903.

III/I In M67170! UNTTED STATES Patented May 2, 1905.

PATENT Erica FURNACE,

SPECIFICATION forming part of Letters Patent No. 789,093, dated May 2,1905.

Application filed July 13, 1903. Serial No. 165.411.

To all 11/71/0111, it may concern:

Be it known that I, THOMAS E. HUNT, a citizen of the United States,residing at Blue Island, in the county of Cook and State of Illinois,have invented certain new and useful Improvements in Furnaces, of whichthe following is a specification.

Theobject of this invention is to construct a furnace the parts of whichmay be readily assembled and fastened together; and the invention moreparticularly relates to the construction of various portions of thefurnace so that the parts when combined will produce a complete furnacethat is strong, compact, and durable and at the same time may be readilyassembled or disassembled for the purpose of cleaning or repair.

The invention further relates to the supporting shell or casing for thefire-pot and the provision made for the purpose of cleaning the lowerportion of the furnace.

Another feature of the invention is the construction and arrangement ofthe door-casing and the method for locking and unlocking the door andautomatically operating a directdraft damper; and the invention finallyconsists in the features of construction and combination of partshereinafter described and claimed.

In the drawings illustrating the invention, Figure 1 is a view showingthe casing and portions of the interior structure in section and theremaining portions in elevation; Fig. 2, a sectional view of thedoor-casing and the door; Fig. 3, an edge view of the door and thedoor-casing, showing the locking mechanism therefor; Fig. l, a view ofthe inner or acting face of the locking-handle for regulating the door,and Fig. 5 an end edge view of the head on the locking-handle.

The furnace is constructed to have an exterior shell or casing A, havinga tapered top a, provided with a hole a for the attachment of a warm-airpipe, and within the shell or casing is a heating-chamber B ofsubstantially less diameter than the shell or casing and provided with adome-shaped top B, riveted or otherwise secured to the walls of theheating-chamber. Within the heating-chamber is a cylindrical shell (I,within which is located a fire-pot C of any suitable construction, belowwhich is a grate of the usual character, and at the lower rear edge ofthe cylindrical shell is a slot or opening 0, which is regulated orclosed by means of a curved band or strip of metal 0, riveted at itsends by means of rivets c and adapted to close the slot or opening whenlowered, and said band or strip is adapted to be swung up, when sodesired, to expose the opening for the purpose of cleaning the rearportion of the heating-chamber. The cylindrical shell is provided in itsfront wall with an opening d, to which is attached alowerdoor-casing D,which opens into the interior of the furnace below the fire-pot andgrate and enables ashes to be removed therefrom.

In the walls of the heating-chamber, near the top of the fire-pot is anopening a, to which is fitted a door-casing E. and said door-casing isprovided with side walls a of a depth to bridge the space between theexterior shell and the heating-chamber. The casing is further providedwith an inwardly-diverging top wall E and the bottom wall 0 and aroundthe walls is a flange 0 suitably curved to contact the wall of theheating-chamber. The doorcasing is provided with a mouth F in its front,and the mouth is of a size toleave a shoulder f around the front of thedoor-casing, and

around the mouth is an outwardly-projecting flange f, against which thedoor f is adapted to abut. Exterior of the outer shell and abuttingagainst the shoulder f is a removable plate f which surrounds theflange-mouth and secures the shell in place.

Within the heating-chamber, at the rear of the cylindrical shell whichsupports the firepot, is aflue G, which leads from a point near the baseof the cylindrical shell to a point above the fire-pot contained thereinand is open at the bottom,so that the products of combustion underordinary circumstances will be able to travel down around thecylindrical shell and up through the flue, as shown by the arrows, inorder to escape. At the upper end of the flue is an opening g throughthe rear wall of the heating-chamber, which opening leads into a chamberg, and said chamber is provided near its top with an opening g leadingdirectly into the heating-chamber, so that when so desired a directpassage may be provided for the products of combustion from the fire-potup through the heatingchamber and out into the chamber g without thenecessity for passing up through the flue hitherto described. Anescape-flue g leads from the chamber g to the chimney or other egressfor the products of combustion. The opening g is regulated by means of adamper h, provided with a regulating-arm it at right angles to thedamper, and the arm it is of suflicient weight to hold the damper closedunder normal conditions, as shown in Fig. 1. To the arm is attached achain if, which leads around to the front of the furnace and connectswith a locking rod or lever I on the upper door, which locking rod orlever is provided with a series of holes din its handle for theattachment of the chain leading thereto, and the lever terminates in anenlarged pivoted head 6, provided on its inner face with flanges 6 (bestshown in Fig. 4,) leaving a space or gap 71 at the end of the flange,into which a lug f*on the door may be dropped to clear the flange whenthe lever is turned in one position. When, however, the lever is raised,the flange will be turned sufliciently to pass over and inclose the lugon the door, locking the same, as shown in Fig. 1. As shown in Fig. 1,when the door is closed and locked the elevated position of the leverwill release the chain and allow the damper h to drop; but when the dooris in position to be opened, as shown in Fig. 3, the lever must beforced down, thereby exerting a tension on the chain, which raises thearm It, on the damper, opening the damper leading to the chamber g, andthereby preventing the escape of smoke and gases from the furnace whenthe upper door is open by providing a direct outlet automaticallyoperated for the discharge of gases and unconsumedproducts ofcombustion. By this arrangement it is impossible to open the doorwithout at the same time opening the damper, and likewise when the dooris shut the damper will be simultaneously shut.

In operation the hot air and products of combustion from the lire-potwill be compelled to pass down along the, sides of the flre-pot andbetween the fire-pot and the walls of the heating-chamber in order tofind an escape through the flue, through which they pass up still incontact with the circular wall of the heating-chamber, which is heatedto a high degree. As long as the door of the furnace continues closedthe products of combustion will pass out in this way. When, however, thedoor is opened, a direct passage will be provided, thereby preventingthe escape of fumes or flames from the front of the door. In this way amaximum of safety is obtained without in any way minimizing the heatingcapacity of the furnace.

What I regard as new, and desire to procure by Letters Patent, is

1. In a furnace, a fire-pot, a supporting shell or casing surroundingthe fire-pot, provided with a groove or crack in its lower edge, acurved ring or band pivoted at its end and extending around the interiorof the supporting shell or casing, normally closing the groove or crack,and adapted to be raised to expose the groove or crack, substantially asdescribed.

2. In a furnace, the combination of a heating-chamber, a'fire-pot withinthe heatingchamber, an opening leading from the chamber, adampercontrolling said opening, a door opening into the heating-chamber, acasing for the door, a lever terminating in an enlarged head and pivotedto the door-casing, a lug on the edge of the door, a flange extendingpartially around the inner edge of the head, leaving an opening intowhich the lug is adapted to enter when the lever is in one position, andto be held by the flange when the lever is turned into another positionfor locking the door, and a connection between the damper and the leverfor opening the damper by the movement of the lever when the lever isthrown into position to allow the door to be opened, substantially asdescribed.

3. In a furnace in combination with a heating-chamber and an exteriorshell, a door-casing havinga body of suflicient depth to bridge thespace between the walls of the heating-' chamber and exterior shell andprovided with a top wall having an upward slope toward the interior ofthe furnace and provided around its inner rim with outwardly-extendingflanges adapted to contact the walls of the heatingchamber and furtherprovided at its outer rim with an outwardly-extending flange of a sizeto leave a shoulder at its point of jointure with the body of thecasing, a door fitted to said flange, and a removable exterior plateprovided with an opening and adapted to inclose the forwardly-extendingflange and abut against the exterior shell and against the shoulder onthe door-casing, substantially as described.

4. In a furnace in combination with a heating-chamber and an exteriorshell, a door-casing having a body of suflicient depth to bridge thespace between the walls of the heatingchamber and exterior shell andprovided around its inner rim With outwardly-extending flanges adaptedto contact the walls of the heating-chamber and further provided at itsouter rim With an outwardly-extending flange of a size to leave ashoulder at its point of jointure With the body of the casing, a doorfitted. to said flange, and a removable exterior plate provided With anopening and adapted to inclose the forwardly-extending flange and abutagainst the exterior shell and against the 10 shoulder on thedoor-casing, substantially as described.

' THOMAS E. HUNT.

Witnesses:

WALKER BANNING, SAMUEL W. BANNING.

